Connected: An Internet Encyclopedia
RFC 1122 - 4.1.3.1 Ports

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### 4.1.3.1 Ports

UDP well-known ports follow the same rules as TCP well-known ports; see Section 4.2.2.1 below.

If a datagram arrives addressed to a UDP port for which there is no pending LISTEN call, UDP SHOULD send an ICMP Port Unreachable message.

Next: 4.1.3.2 IP Options

Connected: An Internet Encyclopedia
RFC 1122 - 4.1.3.1 Ports